如何在Symfony中向TimeType添加约束

use Symfony\Component\Form\Extension\Core\Type\TimeType;
use Symfony\Component\Validator\Constraints\NotBlank;
use Symfony\Component\Validator\Constraints\Range;

// ...

class MyFormType extends AbstractType
{
    public function buildForm(FormBuilderInterface $builder, array $options)
    {
        $builder
            ->add('myTimeField', TimeType::class, [
                'constraints' => [
                    new NotBlank([
                        'message' => '时间字段不能为空。',
                    ]),
                    new Range([
                        'min' => '08:00',
                        'max' => '18:00',
                        'minMessage' => '时间必须在08:00和18:00之间。',
                        'maxMessage' => '时间必须在08:00和18:00之间。',
                    ]),
                ],
            ]);
    }

    // ...
}